<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title></title>
    <style type="text/css">
        div{
            width: 100px;
            height: 100px;
            border: 1px solid red;
            background-color: red;
        }
        #circle{
            border-radius: 50%;
        }
        #circularbead{
            border-radius: 20%
        }
        #circularbead1{
            border-radius: 0 20% 20% 0;
        }
        #border-image{
            border-left: 10px solid red;
            border-right: 10px solid red;
            border-image-source: url("img/2big.jpg");
            border-image-slice:0 25%;
        }
        #box-shadow{
            box-shadow: 10px 10px 5px yellow;
        }
    </style>
</head>
<body>
<h1>圆形</h1>
    <div id="circle"></div>

<h1>圆角</h1>
<div id="circularbead"></div>

<h1>右上、右下圆角 左上、左下直角</h1>
<div id="circularbead1"></div>

<h1>边框背景</h1>
<div id="border-image"></div>

<h1>盒子阴影</h1>
<div id="box-shadow"></div>
</body>
</html>